package thread;

public class SyncApiDemo {
    public static void main(String[] args) {
//        StringBuilder sb=new StringBuilder();
        StringBuffer sb=new StringBuffer();
        Thread t1=new Thread(){
            public void run(){
                for(int i=0;i<10000;i++)
                    sb.append("abc");
            }
        };
        Thread t2=new Thread(){
            public void run(){
                for(int i=0;i<10000;i++)
                    sb.append("def");
            }
        };
        t1.start();
        t2.start();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
        System.out.println(sb.length());
    }
}
